TIP: Make sure you use standard web fonts in your landing page design. Good suggestions are Arial or Verdana sizes 10 to 14.
In this scenario, lets all just keep it simple. Use fonts that are standard to web and all machines, and you won’t have to worry about certain users not being able to see them. Also, it cuts down on development time and support throughout the life of a given landing page. Certain titles on pages may require font size to be bigger versus smaller. Play with that a bit (another element you can test). Even though it’s big and ugly, it may very well convert better.